Atomic Structure and Periodicity

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Across
  1. 2. / Proposed that the electrons could only orbit the nucleus in certain special orbits at different energy levels around the nucleus.
  2. 4. / Atoms of the same element that have different number of neutrons.
  3. 5. / The minimum energy required to remove one mole of electrons from an atom in its gaseous state.
  4. 6. / A horizontal row of elements in the Periodic Table.
  5. 7. / Measure of the tendency of an atom in a molecule to attract a bonding pair of electrons towards itself.
  6. 11. / Oxide of sulphur reacted with hydrogen, its acidity.
  7. 12. / The acidity of aluminum oxide.
  8. 15. / Total number of protons and neutrons in the nucleus.
  9. 16. / Electrons, descending to the first energy level, n=1.
  10. 17. / The weighted average of the masses of the isotopes relative to 1/12 of the mass of a carbon-12 atom.
Down
  1. 1. / an unbroken sequence of frequencies like the visible spectrum of light.
  2. 3. / The mass of one molecule of that substance relative to 1/12 of the mass of carbon – 12 atom.
  3. 8. / Vertical column of elements in the Periodic Table.
  4. 9. / Proposed the mini solar system model of atom.
  5. 10. / emission spectrum that only has certain frequencies of light.
  6. 13. / Has the highest frequency in the electromagnetic spectrum.
  7. 14. / Number of protons in the nucleus.
  8. 18. / The first step in the operation of the mass spectrometer.
  9. 19. / Proposed the plum pudding model of atom.